"The fascination of mystery is so strong that almost all religious and social organizations that exercise or have exercised an inspiring and lasting influence on mankind have wrapped themselves up in the obscurity of mystery, and have even gloried in the mysteries which they were aware of, although they disdained Christianity because of its mysteries. Their mysteries, products of human invention, are of course mere caricatures of the divine mysteries. Either they are plain mystifications with which to dupe the uninitiate, or they are in part genuine, in part spurious truths which lose the noble character of mystery by the very fact that they are proposed to the initiate as evident.
The Christian, on the other hand, is really initiated into the mysteries of God. He rightly regards this initiation as an illumination replete with wonder and grace; but for this very reason he is filled with the deepest reverence for the sublimity of his mysteries. He acknowledges the grace of God with holy gratitude, but without despising the uninitiated. He earnestly desires that they too may participate in this same tremendous grace; and if in former ages Christians kept their mysteries hidden from unbelievers, it was only because of their solicitude that what was sacred should not be profaned and defiled in the eyes and hands of the unclean.
But when the Christian humbly receives the revelation of God’s mysteries as a great grace, he is entitled to a holy pride. With holy pride he can and ought to glory in the exalted mysteries that he possesses by the grace of God; he can and should regard himself as the object of an extraordinary illumination, as an initiate inot the great mysteries, which are hidden from the mighty and wise of this world. Today especially, when a superficial enlightenment with its deceptive glimmer is intent on supplanting the mysteries of our faith, the Christian must be conscious of his sublime illumination and proud of the dawn of a higher, fairer, supernatural world that has risen over him in the faith. How can we call forth and strengthen this lofty consciousness, this holy pride? Not by denying the darkness which still shrouds the mysteries from the eyes of the initiate, but by pointing out that even the feeble ray gleaming forth from the darkness is strong enough at least to herald the incredible magnificence of the mysteries. Such demonstration is what we have desired to furnish in the present work, and thus we hope to make a contribution to the advancement of Christian knowledge and Christian life.”
--The Mysteries of Christianity, 5.